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HomeHealth & MedicineEmergency Care and Hospitalizations Higher Among Cannabis Users

Emergency Care and Hospitalizations Higher Among Cannabis Users

According to a recent study, cannabis users are 22% more likely to visit the emergency department and be hospitalized than non-users.

According to a new study, visits to the emergency department and hospitalizations are 22 percent higher among cannabis users than those who do not.

The study, published in BMJ Open Respiratory Research (Vozoris, Zhu, et al. 2022) and led by researchers at Unity Health Toronto and ICES, found serious physical injury and respiratory-reasons were the two leading causes of ED visits and hospitalizations among cannabis users.

The findings suggest an association between cannabis use and negative health events, which the researchers say should underline the need to educate and remind the public of the harmful impacts of cannabis on health. Recreational cannabis use has increased in Canada since decriminalization in October 2018.

Health Out Comes among Cannabis Users

“Our research demonstrates that cannabis use in the general population is associated with a heightened risk of clinically serious negative outcomes, specifically, needing to present to the ED or be admitted to hospital,” said Dr. Nicholas Vozoris, lead author, a respirologist at St. Michael’s and an associate scientist at the hospital’s Li Ka Shing Knowledge Institute.

“Unlike tobacco, there is some uncertainty or controversy regarding the adverse health impacts of cannabis. Some individuals may perceive that cannabis has some health benefits and is otherwise benign. Our research highlights to those using – or considering to use – cannabis, that this behavior is associated with important negative health events.”

To compare health outcomes among cannabis users and individuals who don’t use cannabis, researchers used data collected in a survey of individuals who self-reported cannabis use and linked it with health administrative data from ICES for Ontario residents ages 12 to 65 years old.

cannabis user

Using propensity score matching – a statistical matching technique – researchers compared the health outcomes of nearly 4,800 individuals who reported any cannabis use in the preceding 12 months with the health outcomes of over 10,000 individuals who reported never having used cannabis or having used cannabis only once and more than 12 months ago.

Researchers incorporated 31 different variables while matching study participants to minimize an unfair comparison, including demographics, multiple physical and mental health diseases, and tobacco, alcohol, and illicit drug use.

The primary goal of the study was to explore whether there was a link between cannabis use and respiratory-related hospitalization or ED visits. The researchers found no significant associations between cannabis use and respiratory-related ED visits, hospitalizations, or death from any cause. However, they did find that overall visits to the ED or hospitalizations for any reason was significantly higher among cannabis users.

In addition to having greater odds of going to the ED or being hospitalized, the findings show that one of every 25 people who use cannabis will go to the emergency department (ED) or be admitted to the hospital within a year of using cannabis.

Among the reasons cannabis users went to the ED or were hospitalized, acute trauma – defined as a bodily injury – was the most common, with 15 percent of cannabis users who got medical attention receiving it for this reason and 14 percent receiving care for respiratory reasons.

“The results of our research support that healthcare professionals and government should discourage recreational cannabis consumption in the general population” said Dr. Vozoris, who is also a scientist at ICES.

“Given the context of cannabis decriminalization in Canada, which has very likely facilitated the broader use of this product in the population, more efforts need to make by our health and political leaders to educate and remind citizens about the harmful impacts of cannabis on health.”

Related Publication

Vozoris, N. T., J. Zhu, et al. (2022). “Cannabis use and risks of respiratory and all-cause morbidity and mortality: a population-based, data-linkage, cohort study.” BMJ Open Respiratory Research 9(1): e001216.

(Note: The content may have been edited for style and setting.)



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